What sand for blinding on a concrete slab?

21 Jan 2021
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United Kingdom
Evening all,

I'm installing insulation on my concrete slab ready for UFH and a 50mm liquid screed.

I think I'll need to install a very thin sand blinding to flatten out the slab a bit, however I can't find anywhere what sand to use above concrete.

I ask this because there is a DPM below the slab, and a DPM will go above the blinding, so I'm thinking any damp sand would trap the water in there forever? Most people recommend sharp sand or building sand for blinding below a slab which can have a lot of water in it.
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